When writing to Cassandra (v 1.0.7) I'm seeing ocasional delays of up to 4 seconds. Below is from the system.log where we are seeing the delays, is this a result of GC and is it worth me tuning these settings in order to fix? If so, any suggestions? adjusting memtable_total_space_in_mb?
*DEBUG [ScheduledTasks:1] 2012-02-27 12:39:03,570 GCInspector.java (line 124) GC for ParNew: 97 ms for 1 collections, 1401494128 used; max is ** 8506048512* <8506048512> DEBUG [WRITE-/127.0.0.1] 2012-02-27 12:39:04,323 OutboundTcpConnection.java (line 206) attempting to connect to /127.0.0.1 DEBUG [RequestResponseStage:27] 2012-02-27 12:39:07,992 ResponseVerbHandler.java (line 44) Processing response on a callback from 1147398@/154.4.196.76 DEBUG [RequestResponseStage:30] 2012-02-27 12:39:07,992 ResponseVerbHandler.java (line 44) Processing response on a callback from 1147403@/154.4.196.76 DEBUG [RequestResponseStage:31] 2012-02-27 12:39:07,992 ResponseVerbHandler.java (line 44) Processing response on a callback from 1147400@/154.4.196.76 DEBUG [RequestResponseStage:25] 2012-02-27 12:39:07,992 ResponseVerbHandler.java (line 44) Processing response on a callback from 1147401@/154.4.196.76 DEBUG [RequestResponseStage:32] 2012-02-27 12:39:07,992 ResponseVerbHandler.java (line 44) Processing response on a callback from 1147402@/154.4.196.76 DEBUG [RequestResponseStage:29] 2012-02-27 12:39:07,992 ResponseVerbHandler.java (line 44) Processing response on a callback from 1147399@/154.4.196.76
